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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>44.10. Transaction Management</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="pltcl-subtransactions.html" title="44.9. Explicit Subtransactions in PL/Tcl" /><link rel="next" href="pltcl-config.html" title="44.11. PL/Tcl Configuration" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">44.10. Transaction Management</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="pltcl-subtransactions.html" title="44.9. Explicit Subtransactions in PL/Tcl">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="pltcl.html" title="Chapter 44. PL/Tcl — Tcl Procedural Language">Up</a></td><th width="60%" align="center">Chapter 44. PL/Tcl — Tcl Procedural Language</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="pltcl-config.html" title="44.11. PL/Tcl Configuration">Next</a></td></tr></table><hr /></div><div class="sect1" id="PLTCL-TRANSACTIONS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">44.10. Transaction Management</h2></div></div></div><p>
+     In a procedure called from the top level or an anonymous code block
+     (<code class="command">DO</code> command) called from the top level it is possible
+     to control transactions.  To commit the current transaction, call the
+     <code class="literal">commit</code> command.  To roll back the current transaction,
+     call the <code class="literal">rollback</code> command.  (Note that it is not
+     possible to run the SQL commands <code class="command">COMMIT</code> or
+     <code class="command">ROLLBACK</code> via <code class="function">spi_exec</code> or similar.
+     It has to be done using these functions.)  After a transaction is ended,
+     a new transaction is automatically started, so there is no separate
+     command for that.
+    </p><p>
+     Here is an example:
+</p><pre class="programlisting">
+CREATE PROCEDURE transaction_test1()
+LANGUAGE pltcl
+AS $$
+for {set i 0} {$i &lt; 10} {incr i} {
+    spi_exec "INSERT INTO test1 (a) VALUES ($i)"
+    if {$i % 2 == 0} {
+        commit
+    } else {
+        rollback
+    }
+}
+$$;
+
+CALL transaction_test1();
+</pre><p>
+    </p><p>
+     Transactions cannot be ended when an explicit subtransaction is active.
+    </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="pltcl-subtransactions.html" title="44.9. Explicit Subtransactions in PL/Tcl">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="pltcl.html" title="Chapter 44. PL/Tcl — Tcl Procedural Language">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="pltcl-config.html" title="44.11. PL/Tcl Configuration">Next</a></td></tr><tr><td width="40%" align="left" valign="top">44.9. Explicit Subtransactions in PL/Tcl </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 44.11. PL/Tcl Configuration</td></tr></table></div></body></html>
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